An empirical model to obtain the kinetic parameters of lignocellulosic biomass pyrolysis in an independent parallel reactions scheme

Rueda-Ordóñez, Yesid Javier; Tannous, Kátia; Olivares-Gómez, E.

doi:10.1016/j.fuproc.2015.09.001

Cited by 28 publications

(15 citation statements)

References 35 publications

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“…The reaction mechanism is expressed by Equation (2) according to Arrhenius' law: According to the deconvolution results, the degradation of hemicellulose occurs in the range of 230-360 • C, with a maximal peak around 296 • C. The degradation of cellulose takes place in the range of 285-380 • C with a maximal peak at 335 • C. In turn, the thermal degradation of lignin is slow and occurs in the range of temperature of 200-600 • C, with a maximal peak at 381 • C. These results are in good agreement with previous studies conducted by Ali et al [23], and Rueda-Ordóñez et al [27]. The areas of peaks (lumps) 1, 2, and 3 stand for the hemicellulose, cellulose, and lignin fractions, respectively.…”

Section: Isoconversional Kinetic Methodssupporting

confidence: 91%

“…According to the literature, the activation energy for the thermal decomposition of hemicellulose, cellulose, and lignin is in the ranges of 92.9-167.1, 108.6-212.0, and 40-226.5 kJ/mol, respectively. Logarithmic values of the pre-exponential factor for the thermal decomposition for cellulose, hemicellulose, and lignin are, according to the literature, 14-19 [49], 10.13 ± 0.09, and −0.47 ± 0.66 [27], respectively. Discrepancies between the literature data and obtained results are caused by the complex structure of lignocellulosic biomass; thus, the exact mechanism of pyrolysis is unclear.…”

Section: Nonlinear Regressionmentioning

confidence: 99%

“…There are many studies on the kinetics of lignocellulosic biomass pyrolysis in which the reaction mechanisms and general kinetic parameters are determined without examining the kinetics of biomass pseudocomponents [21,22,25,26]. Some authors determined the kinetic parameters of pseudocomponents of lignocellulosic biomass: hemicellulose, cellulose, and lignin [19,23,27]. There are also studies on selected hemicellulose, cellulose, and lignin [28,29].…”

Section: Introductionmentioning

confidence: 99%

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Thermogravimetric Kinetics of Selected Energy Crops Pyrolysis

2020

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The main purpose of this paper was to compare the pyrolysis kinetics of three types of energy crops: Miscanthus giganteus, Sida hermaphrodita, and Sorghum Moench. Studies were conducted in thermobalance. Feedstock samples were heated up from ambient temperature to 600 °C under an inert argon atmosphere. Three heating rates of β = 5, 10, and 20 °C/min were applied. Reactions occurring in the given temperature ranges were grouped together into so-called lumps identified by the deconvolution of derivative thermogravimetry (DTG) curves that corresponded to biomass compositions (hemicellulose, cellulose, and lignin). For the estimation of the activation energy and pre-exponential factor, the Friedman and Ozawa–Flynn–Wall methods were used. The final kinetic parameters were determined by nonlinear regression assuming that thermal decomposition proceeded via three parallel independent reactions of the nth order. The activation energy of hemicellulose, cellulose and lignin was determined to be in the range of 92.9–97.7, 190.1–192.5, and 170–175.2 kJ/mol, respectively. The reaction order was in the range of 3.35–3.99 for hemicellulose, 1.38–1.93 for cellulose, and 3.97–3.99 for lignin. The obtained results allow us to estimate the pyrolytic potential of energy crops selected for this study, and can be used in designing efficient pyrolizers for these materials.

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Section: Isoconversional Kinetic Methodssupporting

confidence: 91%

Section: Nonlinear Regressionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermogravimetric Kinetics of Selected Energy Crops Pyrolysis

2020

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“…Estimated yields of different feedstocks using literature correlations. M max denotes the maximum weight of the feedstock that can be loaded for one batch into the reactor based on bulk density and Q minimum (kW) the solar flux necessary to achieve a char yield of 20% for the different feedstocks, not accounting for additional heat losses, using kinetic model from [91].…”

Section: Biochar Yield and Provision Of Electrification Servicesmentioning

confidence: 99%

SPEAR (Solar Pyrolysis Energy Access Reactor): Theoretical Design and Evaluation of a Small-Scale Low-Cost Pyrolysis Unit for Implementation in Rural Communities

Caputo

Mašek

2021

Energies

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Energy access and waste management are two of the most pressing developmental and environmental issues on a global level to help mitigate the accelerating impacts of climate change. They are particularly relevant in Sub–Saharan Africa where electrification rates are significantly below global averages and rural areas are lacking a formal waste management sector. This paper explores the potential of integrating solar energy into a biomass pyrolysis unit as a potentially synergetic solution to both issues. The full design of a slow pyrolysis batch reactor targeted at biochar production, following a strict cost minimization approach, is presented in light of the relevant considerations. SPEAR is powered using a Cassegrain optics parabolic dish system, integrated into the reactor via a manual tracking system and optically optimized with a Monte-Carlo ray tracing methodology. The design approach employed has led to the development an overall cost efficient system, with the potential to achieve optical efficiencies up 72% under a 1.5° tracking error. The outputs of the system are biochar and electricity, to be used for soil amendment and energy access purposes, respectively. There is potential to pyrolyze a number of agricultural waste streams for the region, producing at least 5 kg of biochar per unit per day depending on the feedstock employed. Financial assessment of SPEAR yields a positive Net Present Value (NPV) in nearly all scenarios evaluated and a reasonable competitiveness with small scale solar for electrification objectives. Finally, SPEAR presents important positive social and environmental externalities and should be feasibly implementable in the region in the near term.

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“…The multicomponent models are an alternative approach, and the parallel reaction scheme is the most representative of them for the biomass pyrolysis reaction. 19 This process is assumed to be the sum of the inputs of the main components. 17 Equation 1 is applicable for pyrolysis of any component, known as pseudocomponent in this model.…”

Section: Kinetic Modelingmentioning

confidence: 99%

Kinetic Study of the Pyrolysis of Canary Pine: The Relationship between the Elemental Composition and the Kinetic Parameters

Díaz

González

García

et al. 2018

Ind. Eng. Chem. Res.

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The realization of several silvicultural treatments in the Canary Islands entails the felling of the Canarian pine that can be an energy source as lignocellulosic biomass. The kinetic parameters of the pyrolysis of the Canary pine, which were yet unavailable in the literature, were determined. The isoconversional methods of Kissinger and Flynn− Wall−Ozawa and a model-based method were comparatively evaluated. The latter model mentioned considers that it is possible to describe the pyrolysis through a parallel reaction scheme of three pseudo components that represent hemicellulose, cellulose, and lignin. The model fit was improved setting a Gaussian function centered on the peak as the inverse of the error. Using the mean proportions obtained for each pseudocomponent, the elemental chemical composition of the Canarian pine was calculated. The results show a good agreement between the experimental and calculated chemical composition. The difference between both compositions was −3.6%, 0.3%, and 3.7% for C, H, and O, respectively.

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An empirical model to obtain the kinetic parameters of lignocellulosic biomass pyrolysis in an independent parallel reactions scheme

Cited by 28 publications

References 35 publications

Thermogravimetric Kinetics of Selected Energy Crops Pyrolysis

Thermogravimetric Kinetics of Selected Energy Crops Pyrolysis

SPEAR (Solar Pyrolysis Energy Access Reactor): Theoretical Design and Evaluation of a Small-Scale Low-Cost Pyrolysis Unit for Implementation in Rural Communities

Kinetic Study of the Pyrolysis of Canary Pine: The Relationship between the Elemental Composition and the Kinetic Parameters

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